i was wondering what causes blower surge... thx for any info,rm

Ratman!! Where the hell have you been???

Buck

land locked in costa rica and now medellin colombia, but that will be changing as soon as i get my container shipped down with my car, tools, and boat... im building a hotel/hostel on an island a buddy of mine owns about 20 miles off the coast of colombia... it will be a fun project.

how you doing dude, everything good? rm

Huge cam

how huge? you talking huge lift? duration? overlap? a little more info pls. i just bought a blown 496 bbc with a 8/71 on it for my 48 anglia. i want some blower surge just cuz it's cool as hell... i know i will have the only roots blower car in medellin. it will be fun...thx, rm

A lean idle afr makes it surge. It needs to be on the rich side at idle to be smooth.. 13:1 afr and richer.

Do they make any Boost at Idle? My Magnuson Supercharged Silverado still makes about 18" of vacuum at idle and doesn't surge with a 14.7 afr, Do the 8/71 style blowers have any vacuum at idle?

No boost at idle. Vacum until 1800 or so.

It is caused be the different air pressure from top of blower and intake manifold as well as fuel control. If you put a bypass valve in like whipple uses it should stop.

That's a nice setup.. I'm talking about larger cam stuff that has 8-10 in/hg at idle. 14.7 usually surges on those.